A thermometer is a device that measures temperature or a temperature gradient.
A thermometer has two important elements: 1.
a temperature sensor (e.g. the bulb of a mercury-in-glass thermometer or the digital sensor in an infrared
thermometer).
In which some change occurs with a change in temperature; and 2.
Some means of converting this change into a numerical value e.g. the visible scale that
is marked on a mercury-in-glass thermometer or the digital readout on an infrared model.
Thermometers are widely used in technology and industry to monitor processes, in meteorology,
in medicine, and in scientific research.
There are many different types of thermometer available in today�s market.
Before you make your purchase, it is vital that you are made aware of the range of products
available to you.
You should also understand and consider each type of thermometers suitability for various
different uses.
So, Today, we will tell you all about the different types of thermometer and their uses.
You can find different methods of thermometer classification.
We decided to go with the principle of operation as a defining characteristic.
Therefore, there are 6 kinds of thermometer based on how they work.
here we will discuss one by one.
Fast of all, Liquid-in-Glass Thermometer:
This type is the oldest and most common kind of thermometer.
It is used almost everywhere, and its principle of operation is very simple.
This thermometer consists of a glass bulb and stem filled with a working liquid (alcohol
or mercury) and an inert gas.
When the temperature changes, the liquid expand or shrinks.
When paired with a temperature scale, it is possible to use this occurrence to determine
the temperature.
Manometric Thermometer: This type is also known as a pressure-filled
or vapour-pressure thermometer.
It determines the temperature based on the change of pressure in gas or liquid.
Manometric thermometers can be filled with gas such as nitrogen, condensation such as
alcohol, chloromethane, diethyl, or mercury.
Gas Thermometer: A gas thermometer determines the temperature
based on the difference in pressure or volume of gas it is filled with.
There are constant pressure and constant volume gas thermometers.
The latter is more commonly used.
Gas thermometer can be filled with any gas, but the most popular option is hydrogen.
This type works best with very low temperatures.
Bimetallic Thermometer: This is a mechanic thermometer that works
with a bimetal strip.
Bimetal means that it is made of two metals.
The strip is sensitive to the change in temperature, and it causes mechanical displacement, which
is used to determine the temperature.
These thermometers are perfect for higher temperatures, as they become less sensitive
and accurate at lower temperatures.
They can be found in many household appliances like stoves.
Infrared Thermometer: An infrared thermometer is a thermometer which
infers temperature from a portion of the thermal radiation sometimes called black-body radiation
emitted by the object being measured.
They are sometimes called laser thermometers as a laser is used to help aim the thermometer,
or non-contact thermometers or temperature guns, to describe the device's ability to
measure temperature from a distance.
By knowing the amount of infrared energy emitted by the object and its emissivity, the object's
temperature can often be determined within a certain range of its actual temperature.
Infrared thermometers are a subset of devices known as "thermal radiation thermometers".
Digital Thermometer: Digital or electronic thermometers are one
of the most recent developments in the thermometer field.
Instead of using liquids or gases paired with a temperature scale, they have a digital screen,
which can show you the readings in mere seconds.
A digital thermometer has a thermistor that reacts to the change in temperature and projects
the result on the thermometer screen.
Clinical Thermometer:
A medical thermometer (also called clinical thermometer) is used for measuring human or
animal body temperature.
There are three most common clinical thermometers used in hospitals and homes:
1.
Mercury-Filled Thermometers.
One of the oldest types, mercury-filled thermometers are slowly disappearing from most countries.
In addition to not being the most accurate, they might be very dangerous if broken.
The mercury inside is toxic to people and the environment.
2.
Alcohol-Filled Thermometers.
A safer alternative to the previous type, these thermometers use coloured alcohol that
expands when exposed to increased temperature.
However, both of these liquid-filled thermometers require some time to show the temperature.
If you want more immediate results, consider one of the following options.
3.
Digital Thermometers.
Digital thermometers are quickly replacing all of the old liquid-in-glass versions.
They are fast, accurate and convenient.
With the help of oral, rectal and armpit digital thermometers, you can get your results in
mere moments.
Dear sir, Thanks for watching the video.
More update please subscribes our channel Learning Engineering, and get notification
to press the bell icon.